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In telecommunication, pumping is the action of an oscillator that provides cyclic inputs to an oscillating reaction device.
Examples of pumping are the action that results in amplification of a signal by a parametric amplifier, and the action that provides a laser or maser with an input signal at the appropriate frequency to sustain stimulated emission.
In lactation, pumping is the action of extracting milk from a mammalian mammary glands by mechanical means. A milking machine provides this function at commercial dairies, while a breast pump does the same for humans.
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